2Cut 1 cake in half lengthwise, making 2 half-circles. Sculpt 1 half-circle into a head and the other half-circle into a tail. For body, cut 1-inch slice from edge of remaining whole cake. From cut edge, cut out a small inverted U-shaped piece. Place body on tray; arrange head and tail pieces next to body.

3Spoon frosting into large bowl. Stir in enough food color until desired green color. Attach cake pieces with a small amount of frosting. Frost cake with a thin layer of frosting to seal in crumbs. Refrigerate or freeze cake 30 to 60 minutes to set frosting. Frost entire cake.